1. Acceleration

2. Change in Velocity
Each time you take a step you are changing the velocity of your body.
You are probably most familiar with the velocity changes of a moving bus or car.
The rate at which velocity (speed or direction) changes occur is called acceleration.

3. Acceleration= final velocity- starting velocity
time
Change in velocity = final – starting velocity velocity
Acceleration= change in velocity

4. A car traveling at 60 mph accelerates to
90 mph in 3 seconds. What is the
car’s acceleration?
Velocity(final) - Velocity(original)
Acceleration =
time
90 mph - 60 mph =
3 seconds
30 mph =
3 seconds =
10 mph/second

5. Positive acceleration Negative acceleration

6. A car traveling at 60 mph slams on the breaks to
avoid hitting a deer. The car comes to a safe stop
6 seconds after applying the breaks. What is the
car’s acceleration?
Velocity(final) - Velocity(original)
Acceleration =
time
0 mph - 60 mph =
6 seconds
- 60 mph =
6 seconds =
- 10 miles per hour per second

7. - A constant acceleration produces a straight line

8. Acceleration= change in velocity
time
t = 0
t = 1 second
t = 2 seconds
t = 3 seconds

9. Galileo
Same things happen when things fall